Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

Abstract

Many-body methods that use Gaussian-wave packets to describe nucleon spatial distribution have been widely employed for depicting various phenomena in nuclear systems, in particular clustering. So far, however, the chiral effective field theory, a state-of-the-art theory of nuclear force, has not been applied to such methods. In this paper, we give the formalism to calculate the two-body matrix elements of the chiral two-nucleon forces using the Gaussian-wave packets. We also visualize the matrix elements and investigate the contributions of the central and tensor forces. This work is a foothold towards an ab initio description of various cluster phenomena in view of nucleons, pions, and many-nucleon forces.

DOI： 10.1093/ptep/ptad087

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Other Link： https://academic.oup.com/ptep/article-pdf/2023/7/073D03/51004209/ptad087.pdf

Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Sociedad Mexicana de Fisica A C  

The correlation functions of pΞ − and ΛΛ pairs from high-energy pp collisions are investigated in the coupled-channel formalism. The NΞΛΛ coupled-channel potentials obtained in the lattice QCD calculation at almost physical quark masses are employed. The pΞ − correlation function shows the large enhancement from the pure Coulomb case, while the ΛΛ correlation function shows the moderate enhancement from the pure quantum statistics case. This agreement indicates that both the NΞ and ΛΛ interactions are moderately attractive without having quasibound or bound state.

DOI： 10.31349/suplrevmexfis.3.0308124

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Publishing type：Research paper (international conference proceedings)  

The correlation functions of pΞ− and ΛΛ pairs from pp and pA collisions are studied in the coupled-channel framework using the NΞ-ΛΛ coupled-channel baryon-baryon potentials obtained in the lattice QCD calculation at almost physical quark masses. The pΞ− correlation function is calculated to be significantly enhanced from the pure Coulomb case, while the ΛΛ correlation function is slightly enhanced from that of the pure fermion quantum statistics. These features reflect the large and small scattering lengths in the pΞ− and ΛΛ channels in magnitude, and agree with the observed data by the ALICE collaboration. The agreement confirms the S = −2 baryon-baryon potentials from lattice QCD.

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：{IOP} Publishing  

How the nuclear force behaves in cluster states, in particular those consisting of the α clusters, has been investigated so far, but not yet elucidated. Today the chiral effective field theory (EFT) is established and it would shed new light on the microscopic understanding of the cluster states. We aim to address a possible source of the attraction in the cluster states of 8Be in view of the pion exchange. Namely, we investigate whether the two-pion-exchange interaction acts as a dominant attraction in the α + α system as predicted by a previous work. We describe theoretically the cluster structure of 8Be by the Brink model, for which the effective interaction is designed from the realistic nuclear force derived through the chiral EFT. The two-body matrix elements of the chiral interaction with the local-Gaussian bases are formulated within the approximation of the spin-isospin saturation forming an α particle. Introducing a global prefactor to the chiral interaction phenomenologically, the ground and low-lying excited states of 8Be, the scattering phase shift of the α-α system as well, are satisfactorily depicted. The attraction in the cluster states is found to be stemming from the two-pion-exchange contributions dominantly, along with nonnegligible short-range terms. The present work can be the foundation towards constructing realistic cluster models, by which the cluster states will be revealed microscopically in the next step.

DOI： 10.1088/1361-6471/ac58b3

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Language：Others   Publishing type：Research paper (other academic)  

The correlation functions of pΞ− and ΛΛ pairs from pp and pA collisions are studied in the coupled-channel framework using the NΞ-ΛΛ coupled-channel baryon-baryon potentials obtained in the lattice QCD calculation at almost physical quark masses. The pΞ− correlation function is calculated to be significantly enhanced from the pure Coulomb case, while the ΛΛ correlation function is slightly enhanced from that of the pure fermion quantum statistics. These features reflect the large and small scattering lengths in the pΞ− and ΛΛ channels in magnitude, and agree with the observed data by the ALICE collaboration. The agreement confirms the S = −2 baryon-baryon potentials from lattice QCD.

Language：Others   Publishing type：Research paper (scientific journal)  

The momentum correlation functions of S=-2 baryon pairs (pΞ- and ΛΛ) produced in high-energy pp and pA collisions are investigated on the basis of the coupled-channels formalism. The strong interaction is described by the coupled-channels HAL QCD potential obtained by lattice QCD simulations near physical quark masses, while the hadronic source function is taken to be a static Gaussian form. The coupled-channels effect, the threshold difference, the realistic strong interaction, and the Coulomb interaction are fully taken into account for the first time in the femtoscopic analysis of baryon-baryon correlations. The characteristic features of the experimental data for the pΞ- and ΛΛ pairs at the Large Hadron Collider are reproduced quantitatively with a suitable choice of nonfemtoscopic parameters and the source size. The agreement between theory and experiment indicates that the NΞ (ΛΛ) interaction is moderately (weakly) attractive without having a quasibound (bound) state.

DOI： 10.1103/PhysRevC.105.014915

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DOI： 10.1103/PhysRevC.104.054304

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DOI： 10.1103/PhysRevC.104.034612

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DOI： 10.1007/s00601-021-01655-8

Language：Others   Publishing type：Research paper (scientific journal)  

We study the momentum correlation functions of pΞ - and Λ Λ pairs produced in high-energy nuclear collisions by using the coupled-channel framework and the NΞ - Λ Λ coupled-channel baryon-baryon potentials recently obtained from lattice QCD calculations at almost physical quark masses. The calculated results are found to well describe the correlation function data from pp and pPb collisions. This agreement confirms the S= - 2 baryon-baryon potentials from lattice QCD and supports the existence of the H dibaryon as a virtual state around the NΞ threshold.

DOI： 10.1007/s00601-021-01626-z

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Background: The hadron-deuteron correlation function has attracted much interest as a potential method to access three-hadron interactions. However, the weakly bound nature of deuterons has not been considered in the preceding studies. Purpose: The breakup effect of deuterons in the deuteron-Ξ- (d-Ξ-) correlation function CdΞ- is investigated. Methods: The d-Ξ- scattering is described by a nucleon-nucleon-Ξ three-body reaction model. The continuum-discretized coupled-channels method, which is a fully quantum-mechanical and nonperturbative reaction model, is adopted. Results: CdΞ- turns out to be sensitive to the strong interaction and enhanced by the deuteron breakup effect by 6%-8% for a d-Ξ- relative momentum below about 70 MeV/c. Low-lying neutron-neutron continuum states are responsible for this enhancement. Conclusions: Within the adopted model, the deuteron breakup effect on CdΞ- is found to be appreciable but not very significant. Except for the enhancement by several percent, studies on CdΞ- without the deuteron breakup effect can be justified.

DOI： 10.1103/PhysRevC.103.065205

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DOI： 10.1093/ptep/ptaa148

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DOI： 10.1103/PhysRevC.102.054326

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DOI： 10.1103/PhysRevC.102.024332

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DOI： 10.1016/j.physletb.2020.135257

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DOI： 10.1051/epjconf/201922301018

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DOI： 10.1103/PhysRevC.100.034324

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We have found that, in the original paper, the calculated values listed in Table 4 and 5 [Table presented] should have been divided by a factor 9. This is due to the absence of the prefactor

DOI： 10.1016/j.nuclphysa.2019.02.005

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DOI： 10.1103/PhysRevC.100.014316

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DOI： 10.1051/epjconf/201819402007

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DOI： 10.1016/j.physletb.2018.08.005

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DOI： 10.1088/1742-6596/1056/1/012012

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DOI： 10.1103/PhysRevC.97.029901

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DOI： 10.1103/PhysRevC.96.054608

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DOI： 10.1051/epjconf/201716300037

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Although several analyses of the α-transfer reaction16O(6Li, d)20Ne using the distorted wave Born approximation have been performed with the aim to clarify the α-cluster structure of20Ne, they have resulted in poor information on the clustering due to insufficiency of models for the analyses. In this work we propose a precise model employing the coupled-channels Born approximation with the microscopically calculated cluster wave function to elucidate the surface manifestation of the α-particle in the ground state of20Ne. Our calculation has shown improvement of the theoretical calculation compared with that in the previous analyses. We have confirmed numerically that the angular distributed cross section at the forward angles probes only the surface region of the α-cluster wave function. The breakup effect of6Li has been investigated and concluded that only the back coupling is important for the (6Li, d) reaction.

DOI： 10.1088/1742-6596/863/1/012036

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DOI： 10.1088/1742-6596/724/1/012005

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DOI： 10.1051/epjconf/201612206003

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Background: Direct evidence of the α-cluster manifestation in bound states has not been obtained yet, although a number of experimental studies were carried out to extract the information of the clustering. In particular in conventional analyses of α-transfer reactions, there exist a few significant problems on reaction models, which are insufficient to qualitatively discuss the cluster structure. Purpose: We aim to verify the manifestation of the α-cluster structure from observables. As the first application, we plan to extract the spatial information of the cluster structure of the Ne20 nucleus in its ground state through the cross section of the α-transfer reaction O16(Li6,d)Ne20. Methods: For the analysis of the transfer reaction, we work with the coupled-channel Born approximation (CCBA) approach, in which the breakup effect of Li6 is explicitly taken into account by means of the continuum-discretized coupled-channel method based on the three-body α+d+O16 model. The two methods are adopted to calculate the overlap function between Ne20 and α+O16; one is the microscopic cluster model (MCM) with the generator coordinate method, and the other is the phenomenological two-body potential model (PM). Results: We show that the CCBA calculation with the MCM wave function gives a significant improvement of the theoretical result on the angular distribution of the transfer cross section, which is consistent with the experimental data. Employing the PM, it is discussed which region of the cluster wave function is probed on the transfer cross section. Conclusions: It is found that the surface region of the cluster wave function is sensitive to the cross section. The present work is situated as the first step in obtaining important information to systematically investigate the cluster structure.

DOI： 10.1103/PhysRevC.93.034606

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DOI： 10.7566/jpscp.6.030060

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DOI： 10.7566/jpscp.6.030092

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DOI： 10.7566/jpscp.6.020037

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DOI： 10.1103/PhysRevC.91.014604

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DOI： 10.1088/1742-6596/569/1/012023

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DOI： 10.1103/PhysRevC.90.034617

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DOI： 10.1093/ptep/ptu063

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DOI： 10.1051/epjconf/20146603031

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The astrophysical factor of the 8B(p, γ)9C reaction at zero energy, S18(0), is determined from three-body model analysis of 9C breakup processes. The elastic breakup 208Pb(9C,p8B)208Pb at 65 MeV/nucleon and the one-proton removal reaction of 9C at 285 MeV/nucleon on C and Al targets are calculated with the continuum-discretized coupled-channels method (CDCC) and the eikonal reaction theory (ERT), respectively. As a result of the present analysis, S18(0) extracted from the two reactions shows good consistency, in contrast to in the previous studies. © 2013 Springer-Verlag Wien.

DOI： 10.1007/s00601-012-0580-2

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DOI： 10.1007/s00601-013-0611-7

Language：Others   Publishing type：Research paper (scientific journal)  

The astrophysical factor of 8B(p,γ)9C at zero energy, S 18(0), is determined from three-body model analysis of 9C breakup processes. The elastic breakup reaction 208Pb(9C,p8B)208Pb at 65 MeV/nucleon and the one-proton removal reaction of 9C at 285 MeV/nucleon on C and Al targets are calculated with the continuum-discretized coupled-channels method (CDCC) and the eikonal reaction theory (ERT), respectively. The asymptotic normalization coefficient (ANC) of 9C in the p-8B configuration, Cp8B9C, extracted from the two reactions shows good consistency, unlike in previous studies. As a result of the present analysis, S18(0)=66±10eVb is obtained. © 2012 American Physical Society.

DOI： 10.1103/PhysRevC.86.022801

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Subbarrier α transfer reaction 13C(6Li, d) 17O(6.356 MeV, 1/2+) at 3.6 MeV is analyzed with an α + d +13C three-body model, and the asymptotic normalization coecient (ANC) for α+13C → 17O(6.356 MeV, 1/2+), which essentially determines the reaction rate of 13C(α, n)16O, is extracted. Breakup eects of 6Li in the initial channel and those of 17O in the nal channel are investigated with the continuum-discretized coupled-channels method (CDCC). The former is found to have a large back-coupling to the elastic channel, whereas the latter turns out to be signicantly small. The transfer cross section calculated with Born approximation to the transition operator, including breakup states of 6Li, gives (C17O *α13C)2 = 1.03 ± 0.29 fm-1. This result is consistent with the value obtained by the previous DWBA calculation.

DOI： 10.1143/PTP.125.1193